/*全局设置*/
* {
    padding: 0px;
    margin: 0px;
    margin:0 auto;
   
}
#btn1{
	margin: 10px;
	
}
td{
	 text-align: center;
}
.tr1{
	background-color: #d5d5d5;
	
}
#d{
	height:100px;
	width: 800px;
}
.d1{
	margin-top:40px;
	margin-left:40px; 
	float:left;
}

#dd{
	height:200px;
	width: 900px;
}
.d2{
	margin-top:40px;
	margin-left:40px; 
	float:left;
}

#btn2{
	
	margin-left:48%;
}

span{
	color: red;
}